Create new JAXB Marshaller instance in static method… is it ThreadSafe?

Question

I have implemented a util class with the following static method:

public static String objToXml(JAXBContext jaxbContext, ClassA obj) throws Exception{
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Answer 1

Yes you must create a new Marshaller each time around if you are planning to use them multi-threaded.

See Unofficial JAXB Guide

The JAXBContext class is thread safe, but the Marshaller, Unmarshaller, and Validator classes are not thread safe.